Skiving machine



April 18, 1939. N. v. DYER SKIVING MACHINE Filed Feb. 23, 1937 Patented Apr. 18, 1939 UNITED STATES PATENT OFFICE SKIVING MACHINE Application February 23, 1937, Serial No. 127,081

10 Claims.

'I'his invention relates to skiving machines and Y more particularly to machines which are used to skive or bevel the edges of articles of flexible sheet material, such as those used in the manufacture of boots and shoes.

Machines of this kind commonly comprise a knife, a work support over which the work passes to the knife, and a presser which presses the work against the work support during the operation of the machine. The articles operated upon by such machines are commonly made of compressible material such as leather parts of the uppers of shoes or such as box toes the bases of which are felt or fabric; and if such articles vary in 5 different localities, as they commonly do, in the,

According to one feature of the invention, an

unyielding finger, held close to the edge of the knife, is provided for engaging the work at the base of the scarf on that side of the work from which the chip is removed and maintaining that locality of the work always in the same relation to the edge of the knife as the scarf is being progressively made. In the illustrated machine, which is of the type employing a tubular knife, an unyielding presser and a yielding feed roll, the roll has transverse grooves in its periphery; and the finger, which is mounted upon a rigid part of the machine, extends into a groove in the roll. When the machine is at rest, the work supporting surface of the finger coincides substantially with the work supporting surface of the roll; but when the roll yields away from the knife during the passage of a piece of work o through the machine, the iinger projects above the surface of the roll and firmly supports the locality of the work at which the base of the scarf is being formed.

In a slving machine a considerable amount of waste material, such as chips and particles, is produced which, if allowed to accumulate or to be carried around by the feed roll, interferes with the proper operation of the machine. Ac-

cording to another feature of the invention, a wiper is provided for a machine having a tubular knife, and means for operating the wiper to remove waste material from the roll. In the illustrated machine this wiper takes the form of a fan having flexible blades which contact with the roll, dislodge the waste material and blow it away.

These and other features of the invention, including certain details of construction and combinations of parts will be described as embodied 5 in an illustrated machine and pointed out in the appended claims.

Referring to the accompanying drawing,

Fig. 1 is a perspective showing the auxiliary frame of a skiving machine in which the present invention is embodied, and a fragment of the main frame to which the auxiliary frame is pivoted;

Fig. 2 is a perspective of a box toe the rear margin of which has been skived on the machine;

Fig. 3 is a view partly in side elevation and partly in vertical section of the tubular knife and the auxiliary frame, showing the relation of the knife to the feed roll, the presser foot and the finger, a box toe being shown in process of having its rear margin skived; 20

Fig. 4 is a detail on an enlarged scale partly in elevation and partly in vertical section looking in the direction indicated by the arrow in Fig. 3 and showing more particularly how the work is supported at the base of the scarf by the finger. In this figure the edge of the knife is indicated by a dot-and-dash line.

Fig. 5 is a detail, also on an enlarged scale, showing more clearly the relation of the finger to the edge of the knife. 30

The machine in its general organization is or may be substantially like the machine of United States Letters Patent No. 1,301,283, granted April 22, 1919, upon an application led in the name of Albert Latham; and, before describing in detail 35 What is new, the old construction will be briefly outlined. The machine comprises a tubular knife 1, a feed roll 9 and a presser I I. The feed roll is yieldingly supported for bodily up-and-down movement in which it swings about the axis of a horizontal stud I3, and for angular movement in which it swings about the axis of a second horizontal stud I5, the axes ofthe two studs being at right angles to each other. The presser II is carried by an overhanging arm, not shown, is adjustable vertically and angularly, and is rigidly supported against yielding away from the feed roll and knife after having been adjusted. When work is fed through the machine the presser acts through the work to push down the feed roll bodily and angularly to an extent depending upon the position into which it has been adjusted. An edge guide I 1, the stern of which is adjustably held by a vclamping screw I8, engages the edge of the work as it passes through the machine. The overhanging arm with its presser, the tubular knife and the main driving mechanism are all carried by the main frame of the machine, a fragment of which appears at |9 in Figs. 1 and 3. The feed roll and the edge gage are carried by an auxiliary frame 2| which is hinged to the main frame about a vertical pivot 23 so that the auxiliary frame may be swung out, when desired, to give access to the knife. The main frame also carries a countershaft 25 having an enlarged end provided with clutch teeth which, when the auxiliary frame is in the operative position shown, mesh with similar teeth on the enlarged end of a short shaft 21 rotatably mounted in the auxiliary frame. From this short shaft 21 the feed roll is driven by mechanism, not shown. The feed roll has a profile which corresponds to the curvature of the tubular knife and is grooved transversely to form narrow portions provided on their peripheries with teeth, said roll being located partly within the knife. No further description of the machine as thus far described will be given, reference being made to the patent for details not herein shown or described. It will be understood, however, that as the work is fed through the machine (away from the observer as viewed in Fig. 4), the lefthand edge of the work is in contact'with the edge guide 1, and the feed roll 9 is pushed down through the work and tilted to an extent dependent upon the position into which the presser has been adjusted.

Articles operated upon by skiving machines, as has been explained, are commonly made of compressible material, such as leather, felt or fabric, and variations in the thickness -or density of such articles in different localities result in scarfs which are wider in some localities than in others. The illustrated means for obviating this undesirable result takes the form of a thin finger 29 located in one of the grooves in the feed roll 9, the work supporting surface of which engages the under side of the work close to the knife at the locality where the base of the scarf is being formed and on that side of the work from which the chip is being removed. Referring particularly to Fig. 4 in which the work, herein shown as a box toe, is indicated at |09, the base of the scarf which is being formed is at the locality 11:. The feed roll 9 is being depressed somewhat and its left-hand end tilted down by reason of the position into which the presser has been adjusted. The finger 29, which does not yield with the feed roll, is maintained at all times at a very small fixed distance from the edge of the knife and, by engaging the work at the base lof the scarf, maintains this locality on that side on which the scarf is being formed always in the same position with respect to the edge of the knife. If the work varies in thickness at this locality, the thicker spots will be compressed when they pass between the presser and the finger 29, since the distance between these two parts does not vary. The result is (Fig. 2) that the scarf is of uniform width throughout, the line 200 at the base of the scarf being parallel to the skived edge 30|) and being a smooth curve or a straight line, depending upon the outline of the skived edge. Although in the illustrated machine the feed roll yields by reason of being spring-mounted, the chip is removed from the under side of the work, and the thicker spots in the work are compressed between the finger and the presser, it should be understood that the invention is not limited to a machine of this type.

Referring more particularly to Figs. l and 3, the mounting and shape of the finger 29 will be described. Mounted upon the top of the auxiliary frame 2| is a plate 3| having an upper face curved to correspond substantially to the curvature of the knife, said plate being adjustably fastened to the auxiliary framev 2| by clamping screws 33 which pass through elongated slots in the plate and are threaded into the auxiliary frame so that this plate may be adjusted toward and from .the knife. Threaded through the forward portion of the plate is a set screw 35 the lower end of which-abuts the top of the auxiliary frame 2|. The forward end of the plate may thereforel be adjusted up and down by manipulating this screw and the screws 33. In the forward end of the plate 3| there is a transverse groove having a curved bottom to receive a finger-carrying block 31, the bottom of the groove being curved to correspond to the curvature of the top of the plate 3|. The bottom of the block 31 and the operativeportion |31'of'its top are also similarly curved. A clampingv screw 39, extending through an elongated slot in the block and threaded into the plate 3|, provides means. for adjusting the block transversely of the plate and of the feed roll 9. The finger 2'9' (Fig. 5) is integral with the block 31 and has a worksupporting face |29 the curvature of which corresponds substantially to the transverse curvature of the feed' roll. The free end ofthe finger 29 is cut away as shownat 229 to provide clearance for the chips, the curved face |29. terminating in a sharp corner 329. By the. means for adjusting the plate 3| which has been described above, the finger is adjusted. so that its corner 329 lies just below and in front of the` edge of the knife 1. It will be understood of course that the finger will be located in the particular groove 'of the feed roll which will cause it, when work is passing through the machine, to engage the base of the scarf. Assuming that'the' edge guide,v the presser and the finger have been adjusted for a scarf having a width of three-eighths of an inch and it is desired to make a scarf having a width of seven-sixteenths of an inch on work of substantially the same' thickness, the position of the finger usually need not be changed. All that is necessary is to make small adjustments of the edge guide and the presser. If, however, a scarf considerably wider than three-eighths of an inch is desired, not only will the presser and the edge guide have to be adjusted'considerably, but the finger will have tobe located in another slot in the feed roll.

In a skiving machine, as has been explained, a considerable amount of waste material is produced which, if not removed from the roll, would: tend to interfere with the proper operation of the machine. In order to remove suchfmaterial the machine is provided with a rotary cleaning member which wipes the waste material from the roll and carries it away'. This'r'otary cleaning member comprises a hub 4| having on its periphery three sockets withV comparatively thin walls of thin steel in whichthe bases of fiexible blades 43 are clamped by screws 45, the hub. being fastened by a tapered pin 41 to' af horizontal shaft 49. These blades may be made of any suitable wear-resisting material, such for' example as the rubberized fabric used in automobile tires. The shaft 49 is rotatably mounted in a bearing formed in the upper part' of av bracket 5I which is fastened to a vertical wall of the auxiliary frame 2| by cap screws 53. This shaft carries near its right-hand end (Fig. 3) a collar 55 adjustably fastened to the shaft by a set screw 51, and at its left-hand end it carries a grooved pulley 59 fastened to the shaft by a tapered pin 6I. A round belt 63 passes around this pulley and around a second grooved pulley 65 which is fast to the outer end of the short shaft 21. Consequently, when the auxiliary frame 2| occupies its operative position shown with the short shaft 21 clutched to the countershaft 25, the cleaning member is rotated'. It will be noted (Fig. 3) that the planes of the blades 43 are oblique to the axis of the shaft 49 and that the blades themselves are inclined to the right from their bases to their free ends so that the cleaning member not only wipes over the periphery of the roll longitudinally of the roll to dislodge waste material from the roll but acts also as a fan or blower to carry the waste material away from the roll and out of the hollow of the knife.

Although the invention has been set forth as embodied in a skiving machine of a tubular knife type, it should be understood that the invention is not limited in the scope of its application to the particular machine which has been shown and described.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A skiving machine for producing a comparatively wide scarf on a piece of sheet material having, in combination, a knife, a yielding work support over which the work is fed to the knife, a presser for pressing the work against the support and an unyielding finger for engaging the work at the base of the scarf and maintaining that locality of the work always in thersame relation to the edge of the knife.

2. A skiving machine for producing a comparatively wide scarf on a piece of sheet material having, in combination, a knife, a yielding work support over which the work is fed to the knife, a presser for pressing the work against the support and an unyielding finger for engaging the work at the base of the scarf on that side of the work from which material is being removed and maintaining that locality of the work always in the same relation to the edge of the knife.

3. A skiving machine for producing a comparatively wide scarf on a piece of sheet material having, in combination, a yielding feed roll, a knife, a presser for pressing the work against the feed roll and a finger for .engaging the work at the base of the scarf and maintaining one side of the work at that locality always in the same relation to the edge of the knife irrespective of variations in the thickness of the work.

4. A skiving machine for producing a compara- 'tively wide scarf on a piece of sheet material having, in combination, a yielding feed roll, a knife,

a presser for pressing the work against the feed roll and a thin, rigid finger independent of the presser and roll for engaging the work at the base of the scarf and maintaining one side of the work at that locality always in the same relation to the edge of the knife irrespective of variations in thickness of the work.

5. A skiving machine for producing a comparatively wide scarf on a piece of sheet material having, in combination, a yielding feed roll, a knife, a presser for pressing the work against the feed roll and a rigid finger adjustably mounted on a rigid part of the machine for engaging the work at the base of the scarf.

6. A skiving machine having, in combination, a feed roll mounted for yielding bodily and angular movement, said roll having transverse grooves in its periphery, a tubular knife, a presser for holding the work upon the roll, and a finger extending into one of the grooves and having its work-contacting portion maintained at all times close to the edge of the knife irrespective of the movements of the feed roll.

7. A skiving machine having, in combination, a feed roll mounted for yielding bodily and angular movement, said roll having transverse grooves in its periphery, a tubular knife, a presser for holding the work upon the roll, a finger extending into one of the grooves and having its work-contacting portion maintainedat all times close to the edge of the knife irrespective of the movements of the feed roll, and means for adjusting the finger.

8. A skiving machine having, in combination, a feed roll mounted for yielding bodily and angular movement, said roll having transverse grooves in its periphery, a tubular knife, a presser for holding the work upon the roll, and a finger extending into one of the grooves and having its work-contacting portion maintained at all times close to the edge of the knife irrespective of the movements of the feed roll, the work-contacting surface of the finger terminating in a sharp corner which is located just in advance of and below the edge of the knife.

9. A skiving machine having, in combination, a tubular knife, a feed roll having a profile curved to correspond to the curvature of the knife and located partly within the knife, and a continuously rotated roll-cleaning member also located partly within the knife, said member having flexible blades and being located in position to cause the blades to wipe the roll.

10. A skiving machine for producing a comparatively wide scarf on a piece of sheet material having, in combination, a knife, a yielding feed roll, a presser for engaging one face of the margin of the work and pressing the margin of the opposite face against the feed roll, and a thin rigid finger for engaging the work at the base of the scarf on that face of the work from which material is being removed.

NEWELL V. DYER. 

